Synthesis of YVO 4:Eu 3+/YBO 3 heteronanostructures with enhanced photoluminescence properties

Abstract

Novel YVO 4:Eu 3+/YBO 3 core/shell heteronanostructures with different shell ratios (SRs) were successfully prepared by a facile two-step method. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy were used to characterize the heteronanostructures. Photoluminescence (PL) study reveals that PL efficiency of the YVO 4:Eu 3+ nanocrystals (cores) can be improved by the growth of YBO 3 nanocoatings onto the cores to form the YVO 4:Eu 3+/YBO 3 core/shell heteronanostructures. Furthermore, shell ratio plays a critical role in their PL efficiency. The heteronanostructures (SR = 1/7) exhibit the highest PL efficiency; its PL intensity of the 5D 0- 7F 2 emission at 620 nm is 27% higher than that of the YVO 4:Eu 3+ nanocrystals under the same conditions. © to the authors 2009.